methamphetamine Definition

a synthetic or semisynthetic compound C10H15N that stimulates the central nervous system, is used medically in the form of its crystalline hydrochloride C10H15N·HCl especially to treat attention deficit disorder and obesity, and that is often abused illicitly for its stimulant properties —called also meth, methedrine, speed

methamphetamine in the form of crystals of its hydrochloride salt C10H15N·HCl when used illicitly for smoking, snorting, or injecting —called also crank, crystal, ice